<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    var obj = {
      name: "why",
      age: 18
    }
    console.log(obj)

    // 获取对象的原型
    console.log(obj.name, obj.age)
    console.log(obj.__proto__)
    console.log(Object.getPrototypeOf(obj))
    console.log(obj.__proto__ === Object.getPrototypeOf(obj)) // true


    console.log(obj.message)
    obj.__proto__.message = "Hello World"
    console.log(obj.message)
    
  </script>
</body>

</html>